WEBVTT WILL BE PERFORMED ON BOTH DRIVERS AS PART OF THE INVESTIGATION. THANK YOU. WORKERS MAKE A GRUESOME DISCOVERY IN ALLEGHENY COUNTY. HUMAN REMAINS FOUND ALONG THE RIVER. POLICE HAVE MORE QUESTIONS THAN ANSWERS. BOB MAYO JOINS US LIVE WITH WHAT THEY KNOW SO FAR. BOP. Reporter: THE POLICE CHIEF DESCRIBES WHAT HE SAW AS A TORSO. WORKERS ALONG THE RAILROAD TRACK SAW IT FIRST. WHAT THEY SAW SET INTO MOTION A POLICE INVESTIGATION THAT WAS INTENSIFYING TODAY. ALLEGHENY POLICE DETECTIVES SPENT MUCH OF TODAY BACK AT THE SCENE WHERE THE REMAINS WERE DISCOVERED TUESDAY. AN AUTOPSY CONFIRMED THESE ARE HUMAN REMAINS. THEY KNOW THEY BELONG TO MAN. A MAN BETWEEN THE AGES OF 30 AND 40 YEARS OLD. THE RAILROAD STOPPED TRAINS FROM PASSING ON THE TRACKS FOR THE SAFETY OF INVESTIGATORS AS THEY LOOKED FOR FURTHER EVIDENCE. WHAT THE WORKERS SPOTTED ON TUESDAY WHEN THEY CALLED IN THE CHIEF BROUGHT THE CHIEF AMONG THE FIRST OF THE INVESTIGATORS TO ARRIVE AT THE SCENE. I OBSERVED A TORSO WITH A READILY APPARENT RIB CAGE AND DOWN THE SPINE AND WITH THAT BEING SAID, THE APPROPRIATE CALL WAS MADE. Reporter: THE INVS. ESTIGATION IS NOW IN THE HANDS OF ALLEGHENY COUNTY POLICE. IF YOU HAVE ANY INFORMATION,